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diff --git a/devtools/client/performance/test/browser_perf-tree-abstract-03.js b/devtools/client/performance/test/browser_perf-tree-abstract-03.js
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+/* Any copyright is dedicated to the Public Domain.
+ http://creativecommons.org/publicdomain/zero/1.0/ */
+"use strict";
+
+/**
+ * Tests if the abstract tree base class for the profiler's tree view
+ * is keyboard accessible.
+ */
+
+const { appendAndWaitForPaint } = require("devtools/client/performance/test/helpers/dom-utils");
+const { synthesizeCustomTreeClass } = require("devtools/client/performance/test/helpers/synth-utils");
+
+add_task(function* () {
+ let { MyCustomTreeItem, myDataSrc } = synthesizeCustomTreeClass();
+
+ let container = document.createElement("vbox");
+ yield appendAndWaitForPaint(gBrowser.selectedBrowser.parentNode, container);
+
+ // Populate the tree by pressing RIGHT...
+
+ let treeRoot = new MyCustomTreeItem(myDataSrc, { parent: null });
+ treeRoot.attachTo(container);
+ treeRoot.focus();
+
+ key("VK_RIGHT");
+ ok(treeRoot.expanded,
+ "The root node is now expanded.");
+ is(document.commandDispatcher.focusedElement, treeRoot.target,
+ "The root node is still focused.");
+
+ let fooItem = treeRoot.getChild(0);
+ let barItem = treeRoot.getChild(1);
+
+ key("VK_RIGHT");
+ ok(!fooItem.expanded,
+ "The 'foo' node is not expanded yet.");
+ is(document.commandDispatcher.focusedElement, fooItem.target,
+ "The 'foo' node is now focused.");
+
+ key("VK_RIGHT");
+ ok(fooItem.expanded,
+ "The 'foo' node is now expanded.");
+ is(document.commandDispatcher.focusedElement, fooItem.target,
+ "The 'foo' node is still focused.");
+
+ key("VK_RIGHT");
+ ok(!barItem.expanded,
+ "The 'bar' node is not expanded yet.");
+ is(document.commandDispatcher.focusedElement, barItem.target,
+ "The 'bar' node is now focused.");
+
+ key("VK_RIGHT");
+ ok(barItem.expanded,
+ "The 'bar' node is now expanded.");
+ is(document.commandDispatcher.focusedElement, barItem.target,
+ "The 'bar' node is still focused.");
+
+ let bazItem = barItem.getChild(0);
+
+ key("VK_RIGHT");
+ ok(!bazItem.expanded,
+ "The 'baz' node is not expanded yet.");
+ is(document.commandDispatcher.focusedElement, bazItem.target,
+ "The 'baz' node is now focused.");
+
+ key("VK_RIGHT");
+ ok(bazItem.expanded,
+ "The 'baz' node is now expanded.");
+ is(document.commandDispatcher.focusedElement, bazItem.target,
+ "The 'baz' node is still focused.");
+
+ // Test RIGHT on a leaf node.
+
+ key("VK_RIGHT");
+ is(document.commandDispatcher.focusedElement, bazItem.target,
+ "The 'baz' node is still focused.");
+
+ // Test DOWN on a leaf node.
+
+ key("VK_DOWN");
+ is(document.commandDispatcher.focusedElement, bazItem.target,
+ "The 'baz' node is now refocused.");
+
+ // Test UP.
+
+ key("VK_UP");
+ is(document.commandDispatcher.focusedElement, barItem.target,
+ "The 'bar' node is now refocused.");
+
+ key("VK_UP");
+ is(document.commandDispatcher.focusedElement, fooItem.target,
+ "The 'foo' node is now refocused.");
+
+ key("VK_UP");
+ is(document.commandDispatcher.focusedElement, treeRoot.target,
+ "The root node is now refocused.");
+
+ // Test DOWN.
+
+ key("VK_DOWN");
+ is(document.commandDispatcher.focusedElement, fooItem.target,
+ "The 'foo' node is now refocused.");
+
+ key("VK_DOWN");
+ is(document.commandDispatcher.focusedElement, barItem.target,
+ "The 'bar' node is now refocused.");
+
+ key("VK_DOWN");
+ is(document.commandDispatcher.focusedElement, bazItem.target,
+ "The 'baz' node is now refocused.");
+
+ // Test LEFT.
+
+ key("VK_LEFT");
+ ok(barItem.expanded,
+ "The 'bar' node is still expanded.");
+ is(document.commandDispatcher.focusedElement, barItem.target,
+ "The 'bar' node is now refocused.");
+
+ key("VK_LEFT");
+ ok(!barItem.expanded,
+ "The 'bar' node is not expanded anymore.");
+ is(document.commandDispatcher.focusedElement, barItem.target,
+ "The 'bar' node is still focused.");
+
+ key("VK_LEFT");
+ ok(treeRoot.expanded,
+ "The root node is still expanded.");
+ is(document.commandDispatcher.focusedElement, treeRoot.target,
+ "The root node is now refocused.");
+
+ key("VK_LEFT");
+ ok(!treeRoot.expanded,
+ "The root node is not expanded anymore.");
+ is(document.commandDispatcher.focusedElement, treeRoot.target,
+ "The root node is still focused.");
+
+ // Test LEFT on the root node.
+
+ key("VK_LEFT");
+ is(document.commandDispatcher.focusedElement, treeRoot.target,
+ "The root node is still focused.");
+
+ // Test UP on the root node.
+
+ key("VK_UP");
+ is(document.commandDispatcher.focusedElement, treeRoot.target,
+ "The root node is still focused.");
+
+ container.remove();
+});